GPS 137 05-13-08 - Health Population Growth through history...

Health • Population Growth through history • 5 million in10,000BC, 906 million in 1800, 1,608 in 1900, 3,698 million in 1970, 6,090 million in 2000, 9,370 million in 2050 (projected) • The growth rate has increased over time, peaking in 1970 and has been declining since • As the population grows, natural resources diminish, quality of life decreases (air, climate, congestion, food supply) Causes of human growth • Demographic transition, stages, • Stage one, Early stable , fertility and mortality rates are high, mortality rates vary widely in different locations, 30-35 years life expectancy, infant mortality rates were high, population growth just over replacement • Stage two, Early expanding , population growth surpasses replacement, the invention of soap saved lives, diseases were controlled better, nutrition was improved, drainage of land helped reduce mosquitoes that carried diseases, transportation production etc improved • Stage three, Late expanding , deaths are continuing to decrease, life expectancy has

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